Version information in docs

ISTM it would be very useful if the docs specified what version a
feature that would break in older versions was implemented in. The
example that comes to mind is argument names in CREATE FUNCTION, which
was added in 8.0. The 8.0 docs (http://lnk.nu/postgresql.org/1y3.html)
mention the ability to name arguments, but it doesn't mention that the
feature was added in 8.0 and can not be used in prior versions. Anyone
who's trying to write code that will run on multiple versions of
PostgreSQL would want to know this.
--
Jim C. Nasby, Database Consultant decibel(at)decibel(dot)org
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